Any idea why it works that way?
None at all. And I continue to be mystified that the Firewall appears to block a signal going to Amadeus but not to HiJack.
Neither does the Firewall have any effect on the Apple Sound pref. Whether the Firewall is on or off, the CODEC signal appears on the meters but nothing is audible. Also, the fader can be adjusted but has no effect on the signal level, as seen on the meters.
What even possessed you to consider your firewall as an issue?
Not knowledge….just a simple-minded logical guess. I thought: “What prevents stuff from entering the computer?†and Firewall came to mind, so I gave it a try.
